(Tu) OEM cat back exhaust for 2.4L automatic

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Hi there, has anyone installed the OEM cat back exhaust on their Fiat 500X with 2.4L automatic? If so do you like it? Do you know the gains in HP, Torque and fuel efficiency? They don't have that information at my Fiat dealership. I am getting Go Pedal and possibly a cold air intake but I am considering the cat back exhaust as well. Thanks. kona2000